julia-pfarr/HarmoniCA_impulse-control

HarmoniCA — Impulse Control Model

Part of the HarmoniCA collection for harmonising psychiatric questionnaire items across studies. This model assigns items from impulse control questionnaires to one of six theoretically motivated symptom dimensions.

Dimensions

ID	Label	Description
1	Pathological Gambling	preoccupation with gambling, difficulty controlling gambling urges, time and money spent on gambling
2	Hypersexuality	preoccupation with sex, difficulty controlling sexual urges, time and money spent on sexual activities
3	Compulsive Buying	preoccupation with buying, difficulty controlling buying urges, excessive spending
4	Compulsive Eating	preoccupation with eating, difficulty controlling eating urges, overeating
5	Punding & Hobbyism	stereotyped or repetitive behaviors, excessive engagement with hobbies, purposeless repetitive activities
6	Dopamine Dysregulation Syndrome	compulsive use of dopaminergic medication beyond therapeutic need

Items rated as not belonging to the impulse control construct are assigned dimension -1 (Does not fit).

Model Architecture

• Type: PrototypeModel (prototype-based learning with a fine-tuned sentence transformer)
• Base encoder: hkunlp/instructor-large
• Inference: Fine-tuned encoder with learned class prototypes

The PrototypeModel learns a single prototype embedding per dimension. At inference, items are assigned to the nearest prototype in the fine-tuned embedding space.

Training Data

• Training items: 58 expert-labeled questionnaire items
• Questionnaires: QUIP-C, QUIP-RS
• Labels: Expert consensus from two rounds of surveys (psychiatrists/neurologists)

Evaluation

Evaluated on 124 held-out items from unseen questionnaires against expert labels.

Cohen's κ	Accuracy
0.884	90.3%

Limitations

• Trained on QUIP-RS and QUIP-C; generalization to questionnaires that frame items very differently may be limited.
• Dopamine Dysregulation Syndrome (dimension 6) is Parkinson's-specific and may not be applicable in non-PD contexts.
• Dimension structure reflects theoretical consensus among a specific expert panel and may not match all theoretical frameworks.

Citation

in preparation